I used Dropbox and now MEGA to sync photos off my phone, but I copy all that stuff to my NAS and backups. I use Drive for some things, but I wouldn't be screwed if it went away. I disable almost all the major Google apps on my Android phone and hope to switch out to Lineage + miniG soon.
I use a self hosted TTRss currently (Google Reader was garbage and it dying was really good as I realized what good RSS readers were actually like).
I need to set a reminder to do more regular Facebook exports/backups. No one should be in the situation where a single provider killing your access means you loose a huge chunk of your content. Self hosting has its own problems and yes, a lot of people don't have the knowledge/means/time to do it, but man I'm glad I made it a priority.
My phone number is still on Goolge Hangouts. I need to find a better solution for that as well.